The normal layout uses 4 grids. In Homepage, the content block width = 2 grids. In Detail page mode, the content block width = 3 grids.
How the modules are changed when layout is changed from Wide layout to Normal layout?
The modules in the grid 5 (in Wide layout) will be moved to available grids in Normal layout [grid 3 and 4 or under the content block (in Homepage) and grid 4 or under the content block (in detail page)] in the order from left to right. The moved modules will be located under the modules already in the grids.